23 results about "Radiofrequency field" patented technology

The invention discloses a non-screen POS machine data acquisition method and system based on NFC and a WeChat applet. A POS machine simulates an NFC Type 4 label through a non-contact chip, performs SM2 signature and encryption on equipment data containing a timestamp and a random number by using a private key instantaneously reconstructed by a PUF, and performs Base64URL-CRC packaging, segmented NDEF writing and 30s TTL setting; the mobile terminal automatically pulls up the WeChat applet after triple verification of radio frequency field stability detection, URL white list and integrity fingerprint; the small program uploads parameters through an AES-128-GCM secondary encryption and a Reed-Solomon fragment tunnel; the background adopts a Redis idempotent lock, an HSM private key decryption, an SGX enclave one-time token display mechanism and other mechanisms to complete signature verification and decryption, and it is ensured that the device data are only briefly visible in the WeChat security sandbox. According to the invention, the problems of difficult operation and maintenance data acquisition, high cost and poor security of the non-screen POS machine are solved, and cross-platform, anti-replay and man-in-the-middle-resistant high-security data acquisition can be completed within 10 seconds.

The present invention relates to the field of magnetic resonance imaging technology, and more particularly to a precisely adjustable transmitting coil vibration-damping support device, comprising a magnet, a housing fixedly connected to the interior of the magnet, a gradient coil fixedly connected to the inner wall of the housing, and a transmitting coil extending through the interior of the gradient coil. The present invention overcomes the shortcomings of the prior art by providing an X-axis adjustment hole, a Y-axis adjustment screw, and a first Z-axis adjustment hole. The X-axis adjustment screw can be moved left and right along the interior of a groove, the Y-axis adjustment screw can be turned to drive a lower damping pad and the transmitting coil to move up and down, and the Z-axis adjustment screw can be moved along the interior of the first Z-axis adjustment hole. This allows the transmitting coil to be adjusted in three directions: X, Y, and Z. This allows for precise positioning of the transmitting coil, improves the concentricity of the transmitting coil's radio frequency field, the magnet's B field, and the gradient field of the gradient coil, and thereby improves the image quality of the magnetic resonance imaging system.

The invention relates to the technical field of passive resonators, in particular to a multilayer collaborative metamaterial passive resonator for enhancing an MRI (Magnetic Resonance Imaging) radio-frequency field, which comprises a plurality of metamaterial units arranged in parallel, each metamaterial unit comprises a spiral copper wire, a flexible polyimide substrate and an external capacitor, the external capacitance value is determined through working frequencies of different magnetic resonance systems. Compared with the prior art, the structure of the multi-layer collaborative metamaterial passive resonator is designed, and the resonant frequency of the multi-layer collaborative metamaterial passive resonator is matched with the target frequency, so that the multi-layer collaborative metamaterial passive resonator realizes magnetic resonance radio frequency field enhancement in a target detection area, and the signal-to-noise ratio enhancement of a magnetic resonance image is realized.

A low-temperature dual-core synchronous magnetic resonance imaging radio frequency coil provided by the present invention comprises a radio frequency front-end circuit module and N single-channel low-temperature dual-core radio frequency coil units, each single-channel low-temperature dual-core radio frequency coil unit comprises a radio frequency coil layer, and the radio frequency coil layer is connected with a cold end face of a Peltier module through a heat conduction layer. The hot end face of the Peltier module is connected with the cooling module; the radio frequency coil layer comprises a radio frequency coil main body, the radio frequency coil main body is connected with a double-resonance tuning matching circuit, the double-resonance tuning matching circuit is connected with a transmitting-receiving change-over switch, and the transmitting-receiving change-over switch is respectively connected with a preamplifier and a radio frequency front-end circuit module; and the radio frequency front-end circuit module is loaded on the heat conduction layer of one single-channel low-temperature dual-core radio frequency coil unit. The radio frequency coil layer is in a low-temperature environment, the cost is low, the operation is easy, and electronic thermal noise is effectively inhibited; meanwhile, the single-channel low-temperature dual-core radio frequency coil unit forming the circularly polarized radio frequency field is an independent module and is convenient to repair and maintain.

The application relates to the field of semiconductor packaging and discloses a dual-mode cooperative high-aspect-ratio glass via metallization integrated process, which comprises the following steps: preparing a high-aspect-ratio via by laser modification and wet etching on a glass substrate; preparing a metal seed layer on the surface of the substrate, and hot-press bonding two pieces of substrates to form a stacked structure by using a light-decomposing bonding layer; placing the stacked structure in high-pressure carbon dioxide for pre-lubricating treatment, and then simultaneously applying a pulse direct current and a radio frequency power source for dual-mode cooperative electroplating; after surface polishing, irradiating the bonding layer with ultraviolet light to separate the substrates and perform annealing. The application changes the electric field distribution by means of double-glass stacking, replaces air with high-pressure gas to eliminate the gas-liquid interfacial tension of micropores, and breaks the ion mass transfer barrier with the help of a radio frequency field, so that the problems of bubble blockage and concentration difference polarization in the high-aspect-ratio via are solved, efficient and dense filling of metal in the deep hole is realized, and the substrates can be separated without residual glue and damage.

Systems and methods for producing synthetic radiofrequency recordings are provided. The method includes: determining a first set of waveform signal characteristics based on permutations of generated transmitters of a signal; determining a first set of rules based on permutations of possible configurations of a set of scenarios for the signal; determining a second set of rules based on environment variables for each scenario; generating individual signals based on the first set of waveform signal characteristics, the first set of rules, and the second set of rules; receiving a set of symbols that is a waveform representation of a bit string corresponding to the individual signals; creating a configuration for the individual signals; and generating and labeling based on at least one of the configurations for the individual signals or constraints to the configurations for use in training or testing machine learning models.

An apparatus for characterizing a sample using nuclear quadrupole resonance (NQR) spectroscopy is described whereby a plurality of NQR detectors operate in tandem, whereby each NQR detector is optimized to operate within a designed frequency range, having the means to shuffle the sample from one NQR detector to the next such as an automatic sample changer, having the means of controlling the frequency and amplitude of the radiofrequency field generated by the NQR detector through motors controlling variable capacitors or through the use of varactor diodes, digital capacitors, or digital potentiometers, having a plurality of Zeeman modulation coils to create a magnetic field surrounding the sample which may be arranged to minimize stray fields, such as a toroid, having the means of operating the spectrometer in frequency modulation mode, and having the capability of configuring the device for either continuous-wave NQR or pulsed NQR.

The application discloses a paper-based microfluidic intelligent wound monitoring bandage based on a laser-induced graphene electrode array and a preparation and signal processing method thereof. The bandage comprises a calcium alginate / zinc oxide antibacterial base, a wax-printed paper-based lateral chromatographic microfluidic channel layer, a CO2 laser direct writing LIG multifunctional electrode array, a colorimetric indication area, an NFC wireless communication module and a silver nanowire electrically controlled drug release module. The LIG electrode is fixed and modified by enzymes to detect uric acid, lactic acid, glucose and pH value respectively; the paper-based colorimetric disc detects bacterial protease and TNF-alpha; the NFC radio frequency field provides energy to realize battery-free operation. The built-in signal processing method comprises temperature compensation, cross interference elimination, multi-parameter fusion infection risk scoring and double-threshold closed-loop drug delivery decision. The preparation process mainly uses laser direct writing, screen printing and ion crosslinking, has low material cost and is green and environmentally friendly, and is suitable for closed-loop monitoring and treatment of chronic wounds at home and in clinic.

An apparatus for generating high energy plasma employs a low energy neutral beam injected into a magnetically contained mirror plasma to generate plasma ions that are boosted to fusion levels by a coordinated radio frequency field.

The present disclosure provides an upper electrode assembly, a semiconductor process chamber, and a semiconductor processing device, said upper electrode assembly comprising: a carrier, fixed on a chamber body of a semiconductor process chamber and provided with a receiving hole; a radio frequency isolation ring, carried on the carrier and at least partially located in the receiving hole, and used to block radio frequency energy; a gas spray head, passing through an annular cavity of the radio frequency isolation ring and carried on the radio frequency isolation ring, and capable of feeding radio frequency energy into the semiconductor process chamber; a first positioning and adjustment module, comprising: a fixing member, disposed on the carrier and located outside the radio frequency isolation ring; a pressing member, connected to the fixing member and extending toward a center of the radio frequency isolation ring, and capable of cooperating with the carrier to clamp and position the radio frequency isolation ring and the gas spray head; and an adjustment mechanism, disposed on the fixing member and capable of moving radially along the radio frequency isolation ring to enable radial movement of the gas spray head. The described upper electrode assembly can adjust the concentricity between the respective components, and can also avoid energy crosstalk within the radio frequency field, thereby improving film formation quality.

The invention discloses a passive NFC (Near Field Communication) device and a passive ink screen. The device comprises an NFC antenna, an NFC wireless communication module, a high-speed wireless communication module and an energy acquisition module, the NFC wireless communication module comprises a resonance module and an NFC controller; the NFC antenna is used for sensing an NFC radio frequency field, generating radio frequency induction voltage and realizing NFC communication and NFC energy receiving; the resonance module and an input capacitor controlled by NFC resonate at an NFC carrier working frequency; the NFC controller is used for establishing communication with the NFC reader-writer and starting the high-speed wireless communication module and the energy acquisition module after the communication is established; the high-speed wireless communication module is used for establishing wireless communication connection with the NFC reader-writer after being started to perform data exchange; and the energy acquisition module is used for acquiring and storing energy from the NFC antenna and supplying power to the high-speed wireless communication module. The passive NFC device can achieve high-speed wireless communication with an external NFC reader-writer, and the user experience effect is improved.

The present invention provides an electrical property tomography method, system, device and medium based on instantaneous linearization, wherein the method includes: measuring a magnetic resonance radio frequency field, and calculating a transmission field based on the radio frequency field; calculating point data information of the transmission field using a numerical method; based on the transmission field and the point data information of the transmission field, according to the Maxwell equations, obtaining an initial value of the permittivity and an initial value of the conductivity at each point in space, and determining constraints K, R1 and R2 based on the initial value of the permittivity and the initial value of the conductivity; based on the transmission field, the point data information of the transmission field and the constraints K, R1 and R2, obtaining an iterative equation based on the Maxwell equations combined with the Newton iteration method; determining initial values ​​of the iterative equation based on the initial values ​​of the permittivity and the initial values ​​of the conductivity, substituting the initial values ​​into the iterative equation for iterative calculation, and obtaining the permittivity and conductivity at each point in space after several iterations; and outputting an electrical property tomography image based on the permittivity and conductivity at each point in space.

The invention discloses a real-time simulation resolving system for a complex electromagnetic environment. The system adopts a heterogeneous architecture combining radio frequency scene real-time resolving software and a hardware acceleration unit. Comprising a high-performance computing processing platform, radio frequency scene real-time resolving software and a hardware acceleration unit. The core of the system is that task division is realized through software and hardware cooperation: the calculation processing platform runs radio frequency scene real-time resolving software and is responsible for executing beat-level calculation, including analysis of a guide instruction and an external message, generation of a radiation source signal template and calculation of scene characteristic parameters; the hardware acceleration unit is specially used for pulse-level calculation, generates and modulates a multi-path radiation source pulse sequence in real time according to a signal template and scene characteristic parameters, and finally outputs a high-density staggered pulse stream through a high-speed optical fiber interface after interweaving and sorting. By means of the beat-pulse secondary calculation model, the problems that a traditional scheme is poor in real-time performance and low in fidelity are effectively solved, environment pulse density real-time calculation not lower than one million pulses per second can be supported, and the high-precision and real-time performance test verification requirements of electronic information equipment in the complex and changeable electromagnetic environment are met.

The application discloses an overlapping echo-based magnetic resonance multi-parameter simultaneous quantitative imaging method and system. The method comprises the following steps: designing an overlapping echo-based steady-state free precession multi-parameter quantitative imaging sequence; determining sampling parameters of the overlapping echo-based steady-state free precession multi-parameter quantitative imaging sequence; adding the sequence and setting the sampling parameters in an advanced magnetic resonance instrument which meets the performance requirements of the sequence and the sampling parameters, and completing data acquisition to obtain magnetic resonance data; generating training samples of a deep neural network; training the deep neural network by using the training samples to obtain a trained deep neural network; and reconstructing a magnetic resonance multi-parameter image by using the trained deep neural network and k-space data collected by the magnetic resonance imaging sequence. The method can realize simultaneous quantitative imaging of magnetic resonance multi-parameters, and can utilize different echoes and / or different k-space information in the k-space to realize correction of non-ideal factors, including but not limited to artifacts, radio frequency field inhomogeneity, main magnetic field inhomogeneity and the like.

The application discloses a multi-source micro-energy collection power distribution characteristic evaluation method and device and a storage medium, and relates to the technical field of micro-energy collection. Firstly, a multi-natural environment variable related coupling Copula function model is established according to historical wind speed, illumination, temperature and radio field intensity information of an application site, then a sampling point needing to be evaluated is established based on the probability density distribution characteristics of the natural environment, then the total power corresponding to the output of a mixed micro-energy collection system of each sampling point is calculated based on the power output characteristic curves of each micro-energy collection device, further, the multi-source mixed micro-energy collection system output power evaluation function under the sampling point is established with each natural environment variable as the dependent variable, the sampling point depth is adaptively increased by nesting until the final output power evaluation function is determined, finally, an output power sample sequence is generated, and the multi-source mixed micro-energy collection system output power probability density function is determined based on kernel density estimation.

The application aims at solving the technical problem that the time resolution of the system is difficult to break through the technical barrier of 100 femtoseconds due to the phase jitter between the radio frequency field and the pump laser in the prior art, and providing an ultrafast electron pulse non-jitter static magnetic time compression device and compression method; the device comprises a femtosecond laser, an ultrafast electron gun, an electron beam collimation transmission assembly, an Omega type static magnetic time compression assembly, an electron beam aberration correction and final stage focusing assembly and a sample cavity which are sequentially arranged on the light output path of the femtosecond laser; the Omega type static magnetic time compression assembly is used for introducing an energy related time delay to the ultrafast electron pulse, compensating the initial time chirp of the electron pulse, and compressing the pulse width of the ultrafast electron pulse to below 100 femtoseconds. In the process of electron pulse acceleration and pulse compression, the device does not need to consider the time jitter between the radio frequency field and the femtosecond laser, and can maximize the time resolution of the ultrafast characterization instrument.

The invention relates to the technical field of safety protection equipment manufacturing, and provides a full-shell helmet forming process which comprises the following steps: firstly, trimming and hole cutting are performed on a polycarbonate shell subjected to plastic uptake forming, the polycarbonate shell is respectively attached to an inner shell surface and an outer shell surface of a mold, the closed mold is preheated to a charging temperature after mold closing, and vacuumizing is performed; and the primary pre-expanded polystyrene beads and distilled water are mixed and filled into a forming cavity between the two pieces of polycarbonate through the feeding holes in the bottom or the side wall. A segmented radio frequency field is applied to the electrodes embedded in the opposite side walls of the forming cavity, so that the polystyrene particles are uniformly heated and secondarily foamed and are synchronously fused and bonded with the upper polycarbonate sheet and the lower polycarbonate sheet to form a continuous three-layer structure. And after pressure-maintaining heating is finished, the whole mold is immersed into a cold water tank to be cooled to the demolding temperature, the helmet is taken out, and the adhesive-free, light and weather-resistant helmet is obtained after the helmet is qualified. The process is uniform in foaming, short in takt time and high in weather resistance.

The invention concerns a medical device that combines the simultaneous use of high- gradient magnetic fields and radiofrequency fields for the treatment of patients. The device presents an innovative conductive electrode equipped with specific notches designed to reduce the formation of Eddy currents, which can cause unwanted heating and energy loss. Thanks to these notches, the device allows for more efficient transmission of the magnetic field without compromising radiofrequency intensity, improving both safety and therapeutic efficacy. This innovative design also increases the reliability and longevity of the device, reducing patient risks and maintenance costs.

A method for charging a fully depleted battery of a wireless charging (WLC) device is provided. An RF controller and a read-only non-volatile memory of the WLC device is powered with the RF field of a WLC charger device. The RF controller controls charging of the battery by the RF field using a first charging program stored in the read-only non-volatile memory. A microcontroller of the WLC device is booted up after the battery has reached a predetermined voltage level. The microcontroller loads a second more complex dynamic charging program into a volatile random-access memory (RAM) of the WLC device for execution by the RF controller. The RF controller transitions code execution from the first charging program in the read-only non-volatile memory to the second charging program in the RAM. In another embodiment, the WLC device is provided.

A device for treating a target lesion may include an elongate body comprising a tissue modification device on a distal end of the elongate body. The tissue modification device may include an electrode array and an expandable support structure configured to support the electrode array. When expanded, the expandable support structure is configured to space adjacent electrodes of the electrode array at a substantially equal distance. Further, when expanded, the electrode array is configured to generate one or more tissue modification energy fields around the expandable support structure when an electrical current is supplied to the electrode array. A method of treating a target lesion may include advancing a tissue modification device to a target tissue; expanding the tissue modification device to expand an electrode array; and generating a plurality of zones of radiofrequency (RF) fields through at least a part of the electrode array to ablate the target lesion.

The invention provides a near field communication method and a related device, and when an electronic device enters a radio frequency field emitted by an NFC card reading device, the electronic device can receive a detection frame emitted by the NFC card reading device. The electronic device can send a detection acknowledgement frame to the NFC card reading device after receiving the detection frame, wherein the detection acknowledgement frame can be used for indicating that the electronic device has received the detection frame. The NFC card reading device can send a notification frame to the electronic device after receiving the detection frame, and the notification frame carries the device feature information of the NFC card reading device. After the electronic device receives the notification frame, the first NFC simulation card can be determined from one or more NFC simulation cards through the device feature information of the NFC card reading device. In this way, the electronic device can automatically and accurately select the appropriate NFC simulation card and quickly pop up the card swiping interface of the first NFC simulation card, and the NFC card swiping speed and efficiency are improved.

The application discloses a pseudo-pure state preparation method and device based on radio frequency field inhomogeneity. The pseudo-pure state preparation method comprises the following steps: performing a first unitary operation on a thermal equilibrium state of a nuclear magnetic resonance sample to obtain a first quantum state; performing a second unitary operation on the first quantum state, so that diagonal elements corresponding to nuclear spin polarization components in a density matrix of the first quantum state are rotated to a preset direction, and off-diagonal elements corresponding to nuclear spin polarization components are rotated to a direction perpendicular to the preset direction, to obtain a second quantum state; applying a radio frequency field with predetermined parameters to the second quantum state by using a radio frequency coil to perform a non-unitary operation, to obtain a third quantum state; and performing a third unitary operation on the third quantum state to rotate nuclear spin polarization components in the third quantum state to an initial direction, to obtain a pseudo-pure state of the nuclear magnetic resonance sample. The method does not need to use a gradient field, so that the preparation difficulty is reduced, and the preparation time is shortened.

An apparatus (10; 20) for artificial weathering of samples, lightfastness testing (3; 13), or simulation of solar radiation. The apparatus (10; 20) includes a weathering chamber (1), an electrodeless lamp (4; 14) disposed within the weathering chamber (1), and a radio frequency source. The electrodeless lamp is filled with a composition that is luminescent in a plasma state, and the radio frequency source emits a radio frequency field into the lamp to generate luminescent plasma that emits radiation similar to the spectral characteristics of natural sunlight.